Casio wk 1200 sound cuts out - how do I open it up to fix it?

THe sound on my Casio WK 1200 cuts out when it warms up , like on a hot day. The LCD backlight cuts out, (although you can still read it), and the sound cuts out, although you can still hear the sound, very faint and distorted. This can sometimes be remedied by a sharp tap on the left side of the keyboard, so it might be some loose/dry joint which is temperature sensitive, or a duff capacitor?However, before I fix this, I have to work out how to open it up! I think I've taken out all the screws, but something seems to be preventing top and bottom of the case from opening. Any ideas, please?

I also have a Casio Wk-1200 and it does the same thing. I realized that when I jiggle the back plugs it tends to work for a while. I also have a problem with the pedal plug-in shorting out as well which requires jiggling. When the sound cuts out on my keyboard (as you mentioned above) I also get this ear-piercing high pitched screeching sound and it scares the **** outta me everytime. I can't stand it. Helppppp!I also have a Casio Wk-1200 and it does the same thing. I realized that when I jiggle the back plugs it tends to work for a while. I also have a problem with the pedal plug-in shorting out as well which requires jiggling. When the sound cuts out on my keyboard (as you mentioned above) I also get this ear-piercing high pitched screeching sound and it scares the **** outta me everytime. I can't stand it. Helppppp!

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